
package com.fish.passport.processor.impl.client.newland;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * 
 * @author chenwanchun
 * 
 */
public class Base64 {
	/**
	 * 编码
	 * 
	 * @param bstr
	 * @return String 10.
	 */
	public static String encode(byte[] bstr) {
		return new sun.misc.BASE64Encoder().encode(bstr);
	}

	/**
	 * 解码
	 * 
	 * @param str
	 * @return string
	 */
	public static byte[] decode(String str) {
		byte[] bt = null;
		try {
			sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
			bt = decoder.decodeBuffer(str);
		} catch (IOException e) {
			e.printStackTrace();
		}

		return bt;
	}

	
	
private static char[] base64EncodeChars = new char[]{
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
        'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
        'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
        'w', 'x', 'y', 'z', '0', '1', '2', '3',
        '4', '5', '6', '7', '8', '9', '+', '/'};

private static byte[] base64DecodeChars = new byte[]{
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
        -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
        -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
        41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1};


public static String encode2(byte[] data) {
    StringBuffer sb = new StringBuffer();
    int len = data.length;
    int i = 0;
    int b1, b2, b3;
    while (i < len) {
        b1 = data[i++] & 0xff;
        if (i == len) {
            sb.append(base64EncodeChars[b1 >>> 2]);
            sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
            sb.append("==");
            break;
        }
        b2 = data[i++] & 0xff;
        if (i == len) {
            sb.append(base64EncodeChars[b1 >>> 2]);
            sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
            sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
            sb.append("=");
            break;
        }
        b3 = data[i++] & 0xff;
        sb.append(base64EncodeChars[b1 >>> 2]);
        sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
        sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
        sb.append(base64EncodeChars[b3 & 0x3f]);
    }
    return sb.toString();
}


public static byte[] decode2(String str) throws UnsupportedEncodingException {
    StringBuffer sb = new StringBuffer();
    byte[] data = str.getBytes("US-ASCII");
    int len = data.length;
    int i = 0;
    int b1, b2, b3, b4;
    while (i < len) {
       
        do {
            b1 = base64DecodeChars[data[i++]];
        } while (i < len && b1 == -1);
        if (b1 == -1) break;
       
        do {
            b2 = base64DecodeChars
                    [data[i++]];
        } while (i < len && b2 == -1);
        if (b2 == -1) break;
        sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
       
        do {
            b3 = data[i++];
            if (b3 == 61) return sb.toString().getBytes("iso8859-1");
            b3 = base64DecodeChars[b3];
        } while (i < len && b3 == -1);
        if (b3 == -1) break;
        sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
       
        do {
            b4 = data[i++];
            if (b4 == 61) return sb.toString().getBytes("iso8859-1");
            b4 = base64DecodeChars[b4];
        } while (i < len && b4 == -1);
        if (b4 == -1) break;
        sb.append((char) (((b3 & 0x03) << 6) | b4));
    }
    return sb.toString().getBytes("iso8859-1");
}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Base64 te = new Base64();
		String aa = "更多更多";
		aa = te.encode(aa.getBytes());
		System.out.println("----aa:" + aa);
		String str = aa;
		String str2 = new String(te.decode(str));
		System.out.println("-----str2:" + str2);
		
		
		String s = "更多更多";
        System.out.println("加密前：" + s);
        String x = encode(s.getBytes());
        System.out.println("加密后：" + x);
        String x1 = new String(decode(x));
        System.out.println("解密后：" + x1);

	}
}
